Candy Crush Saga is popular on Facebook but also as a mobile game, which game makers say is where the players are. But despite the game’s undoubtedly sweet appeal, another social media game company, Zynga, didn’t do so well after it went public.

Other mobile game developers are doing well in the global market, particularly GungHo Online Entertainemnt, which created “Puzzle & Dragons” in the Japanese market. That company is expected to see revenue rise by more than 600 percent to $1.95 billion in 2013, the WSJ reported.

King released a Japanese version of Candy Crush Saga recently.

WSJ reporter Rolfe Winkler warned investors to be wary of jumping on the King bandwagon, should the company go public, particularly in light of what happened to Zynga. That company’s stock is down 82 percent from its March 2012 high.

The key is to keep those popular games coming, something that Zynga struggled to do. King recently released Pet Rescue Saga, which is showing some possibilities for growth.